Fluval U2 Underwater Filter The Fluval U2 Underwater Filter is a compact internal aquarium filter designed for aquariums up to 30 US gallons / 110 L, providing 3-stage filtration, water movement, and aeration where external filtration is not possible or not preferred. Compact Internal Filtration for 30 Gallon Aquariums The U2 installs fully inside the aquarium, making it a practical choice for tanks where rear clearance, cabinet space, or external plumbing is limited. It can be used as the main filter in smaller aquariums or as supplemental filtration in larger systems that need extra water movement or localized debris capture. Fluval U2 Filtration Features 3-stage filtration combines foam, poly/carbon, and BIOMAX media for mechanical, chemical, and biological filtration. Adjustable 3-way flow control allows customized water movement and oxygenation. Top output provides maximum circulation and surface agitation for improved aeration. Integrated spray bar creates a gentler, more even flow pattern suited to planted aquariums or quieter movement. Bottom output helps provide deeper water agitation and movement near the lower aquarium area. Flip-top lid allows quick access to filter media for cleaning and replacement. Can be positioned vertically against the aquarium wall or horizontally in shallow water setups. Suitable for freshwater, saltwater, and compatible reptile environments. Fluval U2 Underwater Filter Specifications Item number: A470 UPC: 015561104708 Aquarium capacity: up to 30 US gal / 110 L Pump output: 105 US GPH / 400 LPH Wattage: 5W at 120 V / 60 Hz Dimensions: 8 in L x 3.5 in W x 4 in H / 20 x 9 x 10 cm Filter type: internal underwater filter Filtration stages: mechanical, chemical, and biological Mounting options: vertical or horizontal in compatible aquarium setups U2 Filter Placement Notes The U2 is useful in aquariums where a hang-on-back or canister filter is not practical. Use the top outlet for stronger circulation, the spray bar for gentler distribution, or the bottom outlet to move water lower in the aquarium. Position the filter where it can be accessed easily for media service. Official Fluval U Series Video Setting Up the Fluval U2 Underwater Filter Rinse the included media before use, install the filter inside the aquarium, attach it securely with the mounting hardware, and select the desired flow output. Keep the filter fully submerged during operation and clean the foam pads regularly while preserving biological media in aquarium water during maintenance. What’s Included Fluval U2 Underwater Filter 2 foam filter pads 2 poly/carbon pads BIOMAX biological media
